Thumb screw for accessory devices for a portable camera



FIG. 1 is a front, right and top perspective view of a thumb screw for accessory devices for a portable camera showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of a thumb screw for accessory devices for a portable camera that form no part of the claimed design. 

CLAIM The ornamental design for a thumb screw for accessory devices for a portable camera, as shown and described. 